Webster's Revised Unabridged Dictionary · 1913

Eldest

Eldest , adjective

[Anglo-Saxon yldest, superl. of eald old. See Elder, a.]

1.
Oldest; longest in duration. — Shakespeare
2.
Born or living first, or before the others, as a son, daughter, brother, etc.; first in origin. See Elder.
My lady's eldest son. — Shakespeare
Their eldest historians are of suspected credit. — Bp. Stillingfleet
Collocations (1)
Eldest hand (Card Playing) , the player on the dealer's left hand. — R. A. Proctor